Swelling of the hands and feet at this time should probably not be your primary concern. Your primary concern should be the kidney condition and the cyst you are experiencing in your abdomen. The kidneys’ function are measured according to the presence of urea and creatinin in the blood. Additionally, doctors examine the kidneys using urinary analyses. An ultrasound scan should be also performed to evaluate hydronephrosis. It seems also that the cyst in the abdomen has to be removed as soon as possible.